Faculty of Dentistry, University of Medical Science, La Habana, Cuba.
Clin Oral Implants Res. 2013 Mar;24(3):270-7. doi: 10.1111/clr.12007. Epub 2012 Aug 27.
To evaluate the influence of implant positioning into extraction sockets on bone formation at buccal alveolar dehiscence defects.
In six Labrador dogs the pulp tissue of the mesial roots of (4) P(4) was removed and the root canals were filled. Flaps were elevated bilaterally, the premolars hemi-sectioned and the distal roots removed. The implants were placed in contact with either the buccal (test site) or with the lingual (control site) bony wall of the extraction sockets. Healing abutments were affixed and triangular buccal bony dehiscence defects, about 2.7 mm deep and 3.5 mm wide, were then prepared. No regenerative procedures were done and a non-submerged healing was allowed. After 4 months of healing, block sections of the implant sites were obtained for histological processing and peri-implant tissue assessment.
After 4 months of healing, the bony crest and the coronal border of osseointegration at the test sites were located 1.71 ± 1.20 and 2.50 ± 1.21 mm apically to the implant shoulder, respectively. At the control sites, the corresponding values were 0.68 ± 0.63 and 1.69 ± 0.99 mm, respectively. The differences between test and control reached statistical significance (P < 0.05). Residual marginal bone defects were found both at the test and control sites. A statistically significant difference between test and control sites was only found at the lingual aspects (depth 2.09 ± 1.01 and 1.01 ± 0.48 mm, respectively). Similar heights of the buccal biological width were observed at both sites (about 5.1 mm).
The placement of implants in a lingual position of the extraction sockets allowed a higher degree of bone formation at buccal alveolar dehiscence defects compared with a buccal positioning.
评估种植体在拔牙窝内的位置对颊侧牙槽骨缺损处骨形成的影响。
在 6 只拉布拉多犬中，去除（4）P（4）近中根的牙髓组织，并用根管填充。双侧掀起瓣，将前磨牙半切，然后去除远中根。将种植体置于与颊侧（实验组）或与舌侧（对照组）拔牙窝的牙槽骨壁接触。然后固定愈合基台，并制备约 2.7mm 深、3.5mm 宽的三角形颊侧牙槽骨骨缺损。未进行再生程序，允许非淹没愈合。愈合 4 个月后，获得种植体部位的块状切片，进行组织学处理和种植体周围组织评估。
愈合 4 个月后，实验组骨嵴和骨整合的冠方边界位于种植体肩上方 1.71±1.20mm 和 2.50±1.21mm 处，对照组相应值为 0.68±0.63mm 和 1.69±0.99mm，实验组与对照组之间的差异具有统计学意义（P<0.05）。在实验组和对照组均发现残留的边缘骨缺损。仅在舌侧部位，实验组与对照组之间存在统计学差异（深度分别为 2.09±1.01mm 和 1.01±0.48mm）。在两个部位均观察到相似的颊侧生物学宽度高度（约 5.1mm）。
与颊侧定位相比，将种植体置于拔牙窝的舌侧位置可在颊侧牙槽骨缺损处获得更高程度的骨形成。
